Malicious PDF — malware analysis report

Static analysis result for SHA-256 42306cbfd37cd2a7…

MALICIOUS

PDF

83.0 KB Created: 2021-07-01 17:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66fbc1aa7d3ae7a0635bcc15ed4f065b SHA-1: b111b72929e6d1ba56bc22e7ef9385c1ca716287 SHA-256: 42306cbfd37cd2a79ccd5f16be98dc69e20fe45ba443252c167db9872a33ca63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The primary goal appears to be to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5ce59c66---74944377332.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e8b80046313d19c45e665c1707a2495/xozebakiboxilovoxunejon.pdf
    • http://unseretochter.com/images/file/42339848201.pdf
    • http://hurtmar.pl/Upload/file/15817978883.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/737160078146aca15d4cd16aed1f5a27/89494092069.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6bdb9c39e---4305672519.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f784b41cf6012c2d5be19504bfc6ab98/50236620126.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/muwesexizegaje.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6ab13c94---nexevuwimum.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090572980cb4---14778515891.pdf
    • https://puppometalli.eu/file/femosojoxulejapam.pdf
    • http://ajivikafinance.com/userfiles/file/24349835588.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/guwawebadetovawez.pdf
    • https://tonitomov.com/picture/file/suxawarove.pdf
    • http://mariangelesorrico.com/galeria/files/warixujijadulediwop.pdf
    • http://xn--e42bt3l.net/upfile/files/70720930287.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/68613979900.pdf
    • http://sns.hu/_user/file/dotadagodonujitugat.pdf
    • http://tafgambiatours.com/userfiles/file/66960685881.pdf
    • http://mamnonlittlesun.com/upload/files/napunogofogijoxuzusi.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/xobufugemojezosigusula.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fluent+in+another+language
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16792 bytes
font_01_sfnt_off0000fa71.bin
d0c6f25d70cbe3f0ba338ce16e72d2ffbd7e221f4f4b19c056995ac7a5518dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 16940 bytes
font_02_sfnt_off0001266a.bin
6f8bf11357850ba2eb95efaf4527692c29fdb19d4c46a884a173193754fb368a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 10296 bytes

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